I have recently attempted to hookup two 5-button desksets to one port by using a 2-connection 8-wire plug-in splitter at the wall plug. The hookup doesn't seem to allow either deskset to operate properly. Will the Merlin 2 system support two desksets attached to one port? If so, what must be done? Thanks for considering my question.

No you can't put 2 merlin phones on one port. You are taking a chance on burning out that port by doing so. Hope this helps
dtmf